#include"apue.h"
#include"apueerror.h"
#define BUFFSIZE 4096
int main(void)
{
	int n;
	char buf[BUFFSIZE];
	while((n = read(STDIN_FILENO,buf,BUFFSIZE)) > 0)
		if(write(STDOUT_FILENO,buf,n) !=n)
			err_sys("write error");
		if(n < 0)
			err_sys("read error");
			exit(0);
}
